18640474 has 8 divisors (see below), whose sum is σ = 28005120. Its totient is φ = 9305436.

The previous prime is 18640469. The next prime is 18640499. The reversal of 18640474 is 47404681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5754 + ... + 8389.

It is an arithmetic number, because the mean of its divisors is an integer number (3500640).

Almost surely, 2^18640474 is an apocalyptic number.

18640474 is a deficient number, since it is larger than the sum of its proper divisors (9364646).

18640474 is a wasteful number, since it uses less digits than its factorization.

18640474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14804.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 18640474 is about 4317.4615227006. The cubic root of 18640474 is about 265.1463484972.

The spelling of 18640474 in words is "eighteen million, six hundred forty thousand, four hundred seventy-four".